Coulomb's Law



q: size of charges(c), ε: relative permittivity (in vaccum ε=1), r: distance between the charges(m)






Electric Fields



E: electric field strength (N/C)








The Principle Of Superposition For electric Fields




In case of 2 electric fields









Work Of Electric Force






Electric Potential Difference







Relation Between E And U





Capacitance



C: capacitance (F), Q: total electric charge(c), U: electric potential (V)



Capacitor



A: are of each electrode plate (m2), d: distance between the electrodes (m), ε: relative permittivity (F/m)



Capacitances In Series







Capacitances In Parallel







Electric Field Energy




Energy Of A Capacitor



V: A.d: volume between two electrode plates